I rushed a big frozen grin onto my face.

The face was bloated, its lips spread in a frozen grin.

A frozen grin was rising on his fat round face.

You may see men on the street any day whose laugh is only a frozen grin with nothing in it but teeth.

His lips were drawn back in a frozen grin.

The dwarf's frozen grin did not change, but his eyes were eloquent.

A brief pause, then his mouth twisted in a frozen grin.

His lips were drawn back from his teeth in a frozen grin of agony.

The man's' teeth clicked shut, hidden behind that frozen grin.

He looked at the Archchancellor's frozen grin and sighed.